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Enhanced near-infrared quantum cutting in GdBO3:Tb3+,Yb3+ phosphors by Ce3+ codoping

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3 Author(s)
Huang, X.Y. ; MOE Key Lab of Special Functional Materials and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, People’s Republic of China ; Yu, D.C. ; Zhang, Q.Y.

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A near-infrared quantum cutting phosphor GdBO3:Tb3+,Yb3+ shows poor optical absorption in the ultraviolet-visible excitation spectral range and weak near-infrared luminescence in the 900–1100 nm range, which strongly limit its practical application in silicon-based solar cells, due to the inefficient excitation of the Tb3+ ions for their intra-4f forbidden transitions. Herein, Ce3+ ion has been codoped as a sensitizer in GdBO3:Tb3+,Yb3+, thus enlarging the absorption linewidth and increasing the absorption cross-sections in the ultraviolet-visible region. The presence of Ce3+ results in an enhancement in Yb3+ near-infrared emission intensity by a factor of ∼30, which makes these phosphors more attractive as luminescent downconversion materials for enhanced silicon-based solar cell performance. The relevant luminescence and energy transfer mechanisms involved have also been investigated. The present results demonstrate that the 4f-5d luminescence of Ce3+ may be used to sensitize the Tb3+Yb3+ downconversion process.

Published in:

Journal of Applied Physics  (Volume:106 ,  Issue: 11 )

Date of Publication:

Dec 2009

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